code: def testZero(self):
      output = self.helper([0] * 100)
  
      self.assertEqual(output[0], 0)
      self.assertEqual(output[1], 0)
  
file_path: essentia/test/src/unittests/sfx/test_derivativesfx_streaming.py
imports: from essentia_test import *
  from essentia.streaming import DerivativeSFX
label_desc: Use image node_id 2 for calling the TestDerivativeSfx_Streaming obj's underlying member method code with example usage: obj.testZero() without return types